[ODE] Getting Triangle Index from a ray-trimesh collision?

[Patrick McColgan]

Hello

I'm looking to collide a ray with a trimesh but on collision I want to 
know the index of the triangle in the trimesh involved.  I've searched 
the mailing list and looked through the documentation and from what I 
can see there is no function to return triangle indices.

Stepping through the collider I can see where the index is found and 
used but currently it isn't returned, is there any external way of 
retrieving it?  Are there any functions at all that return a triangles 
index?

Thanks